Thomas Grainger

Sounds like a starlette TestClient missing a `with`, and then a GeneratorExit closing a BlockingPortal contextmanager?

Oh it should probably just be: ```py def __del__(self, _active_limbo_lock=_active_limbo_lock, _active=_active): ... ```

This is resolved by https://github.com/Textualize/textual/pull/5765